Slabiness or Slabbiness: How To spell?
The word Slabiness is misspelled against Slabbiness, a noun meaning "Quality of being slabby."
Slabbiness has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Sla & iness which should not be misspelled with single 'B'
Wrong Spelling:  Sla-b-iness  Correct Spelling:  Sla-bb-iness 
Find more wrongly spelled words of Slabbiness to spell it well.